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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57f20463b24548d322eda5b957018cbb827951fcaf0ec74a989f748a2c4b48f' 
  AND token = '6iicdoj0Fu4CWJyIgPzaR85Qtsut0Ef2xhrkoWZQy1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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