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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae669b5fa103cec7d2d392409e787cf4aaeb0072f630ab6d471ea0b736c0596b' 
  AND token = 'Vrz+Ge/82TNReeoo0J8x+1B24ErBcaefxiF4OW7tvDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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