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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd657ace79bfec32b2d70999b6dc71e7a0cfa7b4af7f9c11810f2d7797418d7' 
  AND token = 'MkE6NI+Mew9jjFt7KYLN1ch2etGJuL9ruif/AezbNqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}