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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933d24033ecf339b1c96246d4a2c76aa4c63fd21d8d3345ebea9ef9b9150983f' 
  AND token = 'ka7zytSbje4XTfYDnOXXL7iqxwOqSNpoOl3nrzyEkPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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