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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99e0f6167a8ba6e7c99a07b275471c82df7cc1b1e931ad07a02a559a69d7e72' 
  AND token = 'NtqZOk6rzfB28X++GKi5eJ+i1paUvHzaBwI8xD3BhV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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