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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8be7ab5e19b76253eb0b7f9c12cf20c39619d23e684e45b8eac28508113174f' 
  AND token = 'tWWmVXzwwUQo6rCMAGzi0mrQE7+a0JqOIcmb+qSNbdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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