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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6326d8c1b8e383b2832474621e619dec8887af40daf54af32a06872fc69c340' 
  AND token = '64f/rYfkcjJfk5Kbok1KbNZXv1ul/FVMNsdq3Dgmb2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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