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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83da0f3278a1c35c54fa47cc5b885b5ae803ac71437799d8f43f86e6ce4aafa0' 
  AND token = 'PpkIlPxtPu9MhqIwco23o1X9tsjBXqfASY5IW3fyvP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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