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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7118665b30c6d52cfd0d5a1655e97b8a10a9e4ba57867ed4cc397493bb9f7814' 
  AND token = 'hvng814K5ArDOvDiO7+V/MsT69OqqF4Ggv5dk6xZQk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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