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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82872a9de2b340fd8154828a53eac6bfcce286899653125ae992a64fba89f18' 
  AND token = 'hdi55wEyKop8sn3jAMWEkk91uxYRJ3PpYWJDSbhP8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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