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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed28c148bffd157de05dbcc0b24fd976231c5f470024df1510b47c6aae1d952d' 
  AND token = 'N3moU+ylzquHvf+HQ0l2F+UZCcCNWpYFTYNzyAqMs2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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