Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49b77bf68181c80d5ec9ac6353e7090513fd07b1d1cb0d12c4e47b0436527ab' 
  AND token = '7jjmrVjQzjg7KbFZnE6BAMPDSZgltGXr2Sl7rCaobtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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