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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453f2b3bc3cf506a75b5cceb4033f85a32893c3c25c7d8cb0141ff202ddedec8' 
  AND token = 'E9wrvc9FQfEurq+acrz/9smnBam5Z3XfV7o6C6IWRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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