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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3362b352ddfb68881f3390b9c20a31f28c594ac0ea7042497c1067b30d510db' 
  AND token = 'afS5RYHYoQaQyJw8SeR4SGvya0JkZ7cGpD3wOIvv5as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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