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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d5265714dabca9eb38cc9cfd1592f128489079aeb5c727c359f69f2cd1f5e' 
  AND token = '2IyamvHuDM+q4moHo+/I3T6GHHEVajSXQ90P2lTxK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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