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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daecc752060b0db7c655ca95b74c4f3c04773317fe5b2daece7a7ce9302ed51' 
  AND token = '0uKkgmF9VNndmgsLQ7N85rsed1kV6ChG8d1sdrUDB+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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