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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d40f20d32a550f21a955b01b15cac461ba2a761a27b79eb3acb8b3097c35017' 
  AND token = 'bLB7SqkMdYXdequOARazJ4WNK4Fch2VBC1iSqc4Dv8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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