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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e190fef8d99cae501a35158ce89a46d5eb3ba534b70de385c9a216d2db57860' 
  AND token = 'Umvr6WHdr+cZzFKM72FygkrSD+/DBBm8DZAYN8/88Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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