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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34b633b71c0eb0b8b7ad9328aba5eaac9ca03e831b4251b790ebc50ab46b4a8' 
  AND token = '8jmGOIJgYaqu5ODTaMOvN6dRDzbwcMVY7rUSeEcYvcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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