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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c374cf6dde6ca7f59d18dcc6b6aad7bc013fcdbae6d9786bda4e7b597bf0f' 
  AND token = 'n/VS6eQcXAHoSyYAJ2FpD8i6iUQVU010yqdeJwImrwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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