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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aca0f76a1282bbe2a471d6d74b860b75430c492989e66d10ab51d32ac9e29db' 
  AND token = '8oCDCYSEEvNulWCs1qnekq17zG9NkCAL23sQSa+vq94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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