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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67e7d497cb78a5a759eb2df0469173e6b7fb62307d7a1d5ab34df4c68df435d' 
  AND token = 'E0BQ7Io4QEoawGaNaodE7RBjYAkxQ7nKp1NjuvvfWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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