SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6467cf3aa4b65842b1e7d0b37111740f6f2cac99cc892bcb10cd5031def4841e' 
  AND token = 'ZQJJ/RgyvczvajFDq63SDMuY1iT2UTnB9p3ldJfxUqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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