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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a7fec428c189b0539bf3e4540d16d36991227dfa3d769fb718827270317fe5' 
  AND token = 'ptjFOs9EwHRGS3b2fTrUXydob8f6OquwLKYDd7FqOxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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