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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb333f3644ddce73b4eb7a7d67b226eb9f9e122340bad47f886caca125820cb' 
  AND token = 'kkQ4QVL3NJ22SGb7hfxgIkNxFkj1cPqKVjDadta/w6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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