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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a525033a7227d6d0fb94174e5ba6844db6659bb899d6b0ba210d31e9f41d1a77' 
  AND token = '6fr18MLsjmZXp8E5amkfzj7gFMQSbBzlmMYDVz2vwsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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