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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae10d102b17c00df44b89d0d8b4b621f176e7a993900f84b7f5a03acc94586e4' 
  AND token = '7qN2h/G6pIWT8OgmkQ2oAxX58YgbyahkKP6oE6tYJew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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