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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf9c819e046acd85c254f05e05f667172c131f231ae25f72f068ce96173e4d1' 
  AND token = 'HWJ8Fba+UeQ4mwT/UQ9PFIij67nhYDyOAHJko7hG7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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