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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d1fb53ecffb58efcee081c0e556da9d0b72e5b5bfb21eef038a6f96ce80940' 
  AND token = '2ImxsMyXujYzesUIaWNsHdwhDo/0sOjj89B3q2PVZ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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