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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22afe3a0454d9b326a13cddf6323580239a93b39623eddd2db5c63b4fcb486e' 
  AND token = '8Spyon92EpKl92L8CMfijof/tqOVLooJsmAqU260TJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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