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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03ee2f01ac3290c1cd98de371e3b1a962392d78a9d28cde388524a4f0132e8a' 
  AND token = 'rJqg9438pPh4QvfDRbHLpRLNqgZU5HFZibtU4dDq/Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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