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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244192864a2747312a2c365d90e014169e9df52222da192da9cddbaf0245547e' 
  AND token = 'jN3cOcfpc8DrMx/kJ3kc9xW3UF73E1JDvJtPpuNHrII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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