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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7c9818d261eba94c874c92935a46d47396492834e842cf806a384db76d0edd' 
  AND token = 'F6bg6gafJwhFL91GTxQGVNKo9m4ow2BkPI6eD32+Mzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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