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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1ec4106df4a8a8c82871a9d31fe94e3e1822945a09b15b2e0817aeaf26b91f' 
  AND token = 'S6D3RUPJgxRmF0aPPdDuIaPScdFa5sVMA/SI7/8WU+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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