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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d94b006e8192848e1c5608c82f324d7479d648c304a1eaa5b5976e2df9f9756' 
  AND token = '5w7/uwZ4MC7R3pkzzKr4x8VY2UNPuI1651I3fA1WcBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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