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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda9f7d91e068263e155ab94199bb79550001fd6d4fe748d1f94a246b821fd6c' 
  AND token = '9VfPtbkvXhmEin1uKiKYgJU52Qxs4whcc14ZGLIJK8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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