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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819dd0b717dadbee3ae97e5246a6e9728c8d90e11f4284f33613b27969bc95d3' 
  AND token = 'j6jOP4YmNOF9jGKdynejkU5IU7dE9AN4ABXRkZiMq7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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