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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6404a6f98d2255f26fcb34f1d35e8052d3b535bb25db79ab5952f35d9795fb6' 
  AND token = 'MM9nA9iXXBBTYCcAdZiFeQ59UR+anTGTdgoNqwilnng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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