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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba85a97957328727017141b9317bffe7163e140b5b5db7f46e1d1cb5d9526e0' 
  AND token = '3t5TBfWs/DojLetzzEaB74WCy4B73TDToXeuMGeJ4Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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