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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd050c6a1223ba54c41c6f0f6333707c5f1a3f9d67daf983bdaaadeb89465632e' 
  AND token = 'WECa3CCxh7uW4+6QB9BC7XkMwF96JD3kE8dNCNUumKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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