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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd87e035ad67c4a88e50e73750fadfe466eb2b85336345ed20e6542d4fac004f' 
  AND token = 'KTNFTblC8bbJl1XAVJHf75ZOaHppw8jYdazoi7S6PiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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