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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa086bff769d72da8b298b07ad409f6620da2c5894fefa4b0bd627199d1ea6cd' 
  AND token = '1pfFLuKx2FjwK/uBtfaK8AG/xmFlsJ5BJ/Zvn0jime4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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