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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ff3e64247cb1e9a4a52c7b7f7ab204ddc63a3b545d2a900c7720841a9c47aa' 
  AND token = 'qOulo0Ao5Btbr1Nh64Db54Qmt656qVi7dmOLVnHLv84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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