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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0868c8598e62ac258e86d053381b3b19f2d15e75d2ab2aba4d637c92a712f84e' 
  AND token = '5WhFfsb9qxo6jyyz2rT5B6y6AxPpEd8ENqd9T4mP0ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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