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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c3d57a7507e4148e424d5fc9e9b9c5c138e0224c7b7b7702d1d5cccc34f6be' 
  AND token = 'VHZ6ThamQ9mncHP7BL9k8xZIjNzdOiur5VZ7yKvA+hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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