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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32684e0011c674a79fa745a296420eb312ee5c8fae53d8f39dab16533da43ca' 
  AND token = 'IyV4sVSq6RfP6PqM4ffxcZ1QIRB9Fhlk95Hi2mjjvY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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