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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ded479fb1ccedc8eb37f9a946c5ccf8aa665098fb26c8da0e133dbfbd0ff838' 
  AND token = 'r58aZ0fpm3uccshI4ycMnkfzBpU48Zf5LxTtZb2GC9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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