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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01029da7ff68fbeec89286b95f24a6efeef095d59b859f0d08f9e152c223cf22' 
  AND token = '3+NNqmaRRYAJMGeSMvyZizp9ZNoc+zi8thRZTkx+54k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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