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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2414a1f9129e9b96e8756801fbef907917763c85724dc50d38291f86e32ed611' 
  AND token = 'yGGuruZiTCVtr9PlN2Hsdm2O+whBAgxAG21n36gNcd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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