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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd23311389c80f3d922db265548e65d6af982ab21e0c5ea7a26a4368a296eeb3' 
  AND token = 'CGzNZKslhyOKNC7+fbUrsXWxeRlvznCSL3vG1Rcl8ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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