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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd085ef504147eec0b1ea334f65f0bf528b5b3a6f71843ec45c07c6d73a2cde04' 
  AND token = 'AiGsx/s3da3tPzQy2cY+ny/0opnjIBMkpy0i14yGz5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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