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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feae25bbed974b75c74e9479036b77f4d4f917e147eb3b4707d0936cbb62a69e' 
  AND token = '8uFSJ15mwmdgA2MfLe+Cdr1cU1tt9Kj82AOCpntGYZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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