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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdc8e1a30e37725333b37462f7bc11fb5a2442b2412f8631fa61acc9d349da9' 
  AND token = '9hj/S5NRiaycKnMkfYtqOudazyADVzT6ish/2qlQw3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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