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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77fda9d9e1676b91cf0a4d1be87c3c27d5b5461665cd9fea5866b23c6526301' 
  AND token = 'ahaDCYW9RTX4cINHEaaipumIlXqRXh7mhUsprcpID6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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