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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecd88783a8576c46e2f170141e19b8563193ead1f7d47c8ef40502ab8a2722f' 
  AND token = 'OOLCAWBUziw10TctIrZ4fy/sFQ/4zQ81/4nWYdw0XRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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