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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738312dab8d2f42fe931894b57ffe98d303b9ebe9647c5f25796ad7e43b1df0e' 
  AND token = 'HIygLzGTNE769SQz5AH6uiEnDK/TVYb6lyUcRVA53D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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