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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faada2bcb66f450a258f114525de1d8859349e82dd62402442dbe41ee00ff94' 
  AND token = 'gTBWgA9YFmkrB/968PxnlGnTzSALb4uoZpez1dAKWhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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