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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cc2b6a1aee2a140e048c1f9694e0966195b5dbd1ba9b46960f8de64b73dad8' 
  AND token = 'P+zHg5MOP9e8Lia5p1w2L9o+5i3dRpg1lsmnOqLWqmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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