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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2abc6cdbbfdae52aea12e221dd229522b457bfa18a466f2a338fe5d974b45a1' 
  AND token = 'SXv4nqz16/KvE8lBNoi6E5Y5kgqxyjCxbDQKfwR0yf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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