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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41f910f0e43b52bb18b449c1138d2cd8b9f6452a3189b09f81f3b63ccb5a2ae' 
  AND token = 'Sw0MR9UubPTTygZkEaLYOfAkwEuIVfmvb/Wmxi5C28k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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