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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e119a55f087179d690d5fe83b8a4310380bd858982f092b69a4623100115dcad' 
  AND token = 'RSwqc6MAFWH4hxYkCU18IclScDfGqZU0pjvWm6JA2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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