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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4952fba0ae8875f0cd446053b732832c3811a695e7a5303eacb26b182a8b15d' 
  AND token = 'B7hHnLihDq0xasJgI9dkRMWR6o9TEiMNYhWAUwmSXww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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