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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9e8a080c87c0400ab89b841231b9460de877984403ae19ea8c1756080bc0d2' 
  AND token = 'ZUbAoEZy/uuYtNeB6mIORTHodEkXM4T5eQGvXXhoSu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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