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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62187d91b4379e26d3d5c5366903815398ceccde93c933a286a534f1f7b8d3f' 
  AND token = 'BwC7Yr/3ouNFUIEPx7k5cHQ4xGzqP8Wwl3fNToe8bUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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